/Engine/Plugins/Runtime/Metasound/Source/MetasoundGraphCore/Public/MetasoundVertex.h
FOutputVertexInterface is aTVertexInterfaceGroupwhich holds FOutputDataVertexes.
typedef [TVertexInterfaceGroup](API\Plugins\MetasoundGraphCore\TVertexInterfaceGroup)< [FOutputDataVertex](API\Plugins\MetasoundGraphCore\FOutputDataVertex) > FOutputVertexInterface